As a staff person I want to create a future RUP for an agreement that already has an approved RUP so that the approved RUP will be in place in a timely fashion

[LisaMoore1]

See #156 for background on the time considerations when preparing RUPs
See bcgov/range-api#56 for general info on versioning
Where an existing plan is already in place a situation may arise where:

• approved version of the plan exists
• staff starts "next-plan" preparation
• "next-plan" may be signed by agreement holder AND decision maker but does not become "current-plan" until "current-plan" term ends (becoming "former-plan") and

Functional Plan Types (NB related to system statuses but does not capture all of those needed )

• "current-plan" -- plan is signed by all parties and is current legal version
• "next-plan-draft" -- plan start date in the future -- not yet signed by all
• "next-plan-approved" -- plan start date in the future -- all parties have signed
• "former-plan" -- a plan that was "current-plan" exceeds it's original expiry (or extended plan end date) and is no longer legal

Requirements

• staff can start a next-plan-draft from scratch
• staff can start a next-plan-draft making full copy from "current-plan" except usage and yearly schedules data (most likely workflow)
• usage data should populate all available years data from FTA and populate any years outside of current term with final year of agreement data
• staff and agreement holders complete all tasks from draft through approved including considering As a staff person I want to create a RUP with a plan end date beyond the current agreement expiry date so that pre-decision processes (ex. consultation) and approval can be complete before livestock turnout #156 (plan date(s) extend beyond current agreement expiry)
• next-draft plan status clearly visible as being "NEXT" and whatever status is (ex. awaiting feedback, or submitted for review or decision)
• approved next-plan keeps "next-plan" status until "current-plan" reaches expiry becoming "former-plan" and "next-plan's" start date is reached